#!/bin/bash
# I, Ian Kelling, follow the GNU license recommendations at
# https://www.gnu.org/licenses/license-recommendations.en.html. They
# recommend that small programs, < 300 lines, be licensed under the
# Apache License 2.0. This file contains or is part of one or more small
# programs. If a small program grows beyond 300 lines, I plan to switch
# its license to GPL.

# Copyright 2024 Ian Kelling

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

[[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"

# used to have more than one, leaving commented in case we do
#for n in bullseye; do
n=bullseye
if [[ -e /etc/schroot/chroot.d/$n.conf ]]; then
  cd /
  schroot -c $n -- apt-get -y update
  schroot -c $n -- apt-get -y dist-upgrade --purge --auto-remove
fi
#done

# if we haven't upgraded yet
if [[ ! -d /mnt/boot/debianbullseye_bootstrap ]]; then
  exit 0
fi

dev=$(awk '$2 == "/mnt/boot" {print $1}' /etc/mtab)
if [[ ! $dev ]]; then
  exit 0
fi
mkdir -p /mnt/tmptimer
if ! mountpoint /mnt/tmptimer &>/dev/null; then
  mount -o subvol=debianbullseye_bootstrap $dev /mnt/tmptimer
fi
cd /mnt/tmptimer
for d in dev proc sys dev/pts; do
  [[ -d $d ]]
  if ! mountpoint $d &>/dev/null; then
    mount -o bind /$d $d
  fi
done
chroot . apt-get -y update
chroot . apt-get -y dist-upgrade --purge --auto-remove

for d in dev/pts dev proc sys; do
  if mountpoint $d &>/dev/null; then
    umount $d
  fi
done
cd /
umount /mnt/tmptimer